Jerking - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 22 (permalink) Old 01-03-2019, 03:38 PM Thread Starter
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Model: VT600C
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Jerking

I have an intermittent issue with my bike jerking. I believe it is a misfire type jerk. I can ride and it is fine then all the sudden it is like i have a misfire on cylinder then it cuts back in and I get all my power back.

could this be a coil going bad?? I have replace the plugs and still have the issue.


1993 Shadow VT600C
2001 Suzuki Kat 750
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post #2 of 22 (permalink) Old 01-03-2019, 04:32 PM
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If it is a very sharp quick jerk feel probably ignition. I used to use a timing light that I would tape on the windshield wipers of a car and drive till it acted up and then you can see if it spark or fuel. Of course on your bike you may have to ride with the light first on one cylinder then the other.

That is a good way to see what is happening as you are riding, especially under load.


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post #3 of 22 (permalink) Old 01-03-2019, 05:12 PM Thread Starter
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If it is a very sharp quick jerk feel probably ignition. I used to use a timing light that I would tape on the windshield wipers of a car and drive till it acted up and then you can see if it spark or fuel. Of course on your bike you may have to ride with the light first on one cylinder then the other.

That is a good way to see what is happening as you are riding, especially under load.
Yes it feels very quick and sharp. When it kicks back in, it feels like a huge power gain. When it cuts out, it feels and sounds like it is only firing on 1 cylinder.

1993 Shadow VT600C
2001 Suzuki Kat 750
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post #4 of 22 (permalink) Old 01-03-2019, 06:48 PM
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Just for giggles, i'd drain the fuel bowls while you're at it. Make sure you don't have sediments intermittently clogging a jet in the carb for that cylinder. And do one at thing at a time so you know what resolved the issue.

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post #5 of 22 (permalink) Old 01-03-2019, 08:42 PM
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One easy thing to try is to have a spray bottle of water and have it running in a dark area and spray the ignition wires and coils and look for arc over.
And measure the plug wires end to end to see if there is corrosion, or the resistors burned out, etc.


You might also start it and shut it off and drain each carb bowl and see if it looks like both have the same amount of fuel. Maybe a clogged inlet screen slows the flow into the bowls.

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #6 of 22 (permalink) Old 01-04-2019, 09:31 AM Thread Starter
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One easy thing to try is to have a spray bottle of water and have it running in a dark area and spray the ignition wires and coils and look for arc over.
And measure the plug wires end to end to see if there is corrosion, or the resistors burned out, etc.


You might also start it and shut it off and drain each carb bowl and see if it looks like both have the same amount of fuel. Maybe a clogged inlet screen slows the flow into the bowls.
That makes sense. what should the plug wires measure to be?

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2001 Suzuki Kat 750
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post #7 of 22 (permalink) Old 01-04-2019, 09:42 AM
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at $20(ish) for the 2 wires, I wouldn't bother to measure
When in doubt, swap em out

Then you'll KNOW when they were new


Also @swifty2014 taped to the windshield, that's genius! I've been putting cars on blocks and either locking the cruise control or putting a weight on the accel.
your method should be Way easier for reproducing real world circumstances.

Sometimes it seems like I'm arguing, that's just how I work out a solution:.. The other times I'm arguing.

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post #8 of 22 (permalink) Old 01-04-2019, 10:20 AM
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Allot of good responses, just wanted to put what happened to me in the ring, I had a coil crack, didnít see it until one night I revved the bike while diagnosing and at random times the spark would come out the side of the coil and arc to the frame next to the crack.


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post #9 of 22 (permalink) Old 01-04-2019, 12:06 PM
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If you feel like measuring they are about 40,000 ohms or so end to end. They have a 5000 ohm resistor screwed on the end at the plugs. I like keeping the original wires unless they are cracked, etc. Because they are solid copper wires with replaceable end caps. Or take off the resistors and have no resistance.

Only a biker knows why a dog sticks his head out of a car window.
1983 750 Shadow
From the past=
1951 Cushman scooter
1962 Honda 305 Dream
1965 Honda 305 Dream
1971 Honda 175 scrambler
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post #10 of 22 (permalink) Old 01-04-2019, 12:10 PM
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First and cheapest make sure your battery connections are good.

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